Photonic frequency converter for spectrally agile seamless access network in millimeter-wave band
| Project/Area Number |
22K04116
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21020:Communication and network engineering-related
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| Research Institution | National Institute of Information and Communications Technology |
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Principal Investigator |
PHAM TIENDAT 国立研究開発法人情報通信研究機構, ネットワーク研究所フォトニックICT研究センター, 主任研究員 (50636321)
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| Co-Investigator(Kenkyū-buntansha) |
山口 祐也 国立研究開発法人情報通信研究機構, ネットワーク研究所フォトニックICT研究センター, 研究員 (30754791)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2024: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | radio over fiber / photonic down-conversion / fiber radio / optical communications / mobile fronthaul |
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| Outline of Research at the Start |
This research develops and demonstrates a mixer-less transparent fiber-wireless system using direct conversion of radio signal in the millimeter-wave band to optical domain and photonic frequency conversion technology for direct detection and down-conversion of signal to microwave-band.
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| Outline of Annual Research Achievements |
We studied photonic downconversion technology using single and dual wavelength modulation by a newly fabricated optical phase modulator. We compared the system characteristics and transmitted high-order quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) signals in the 43 and 52 GHz bands over the system. We also demonstrated the first radio-fiber-radio-fiber system for transparent delivery of 100-GHz radio signals in the uplink direction using photonic down-conversion. We successfully transmitted 16-QAM single-carrier and OFDM signals with line rates of 30 and 40 Gb/s over the system in the 100-GHz band. We proposed and developed a low-loss and high-bandwidth lithium niobate modulator integrated with an electro-optic frequency-domain equalizer. The fabricated Ti-diffused lithium niobate modulator has a low optical loss of 5.4 dB, low half-wave voltage of 3.7 V, and high bandwidth exceeding 110 GHz.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We successfully developed the key devices for the project, including ultra-broadband optical phase and intensity modulators. We also studied and compared the key photonic down-conversion technologies and used them for signal transmission. For the system demonstration, we demonstrated the transmission, reception, and down-conversion of radio signals in different frequency bands, including at 43, 52, and 100 GHz bands using the developed devices and technologies. The achievements in the first year will be the basic for further studies in the next years. The achieved results have been presented at the top international conferences and published in high-impact journals.
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| Strategy for Future Research Activity |
We will work on higher frequency bands by developing a new optical modulator capable of operating in higher frequencies, such as beyond 110 GHz. The research on generation of a coherent two-tone optical signal with a frequency difference beyond 100 GHz will also be conducted and applied for photonic down-conversion of radio signals. We will use the developed devices and technologies for the system demonstration in the next years, including experiments on transmission of radio signals in beyond 110 GHz using photonic down-conversion technology in both downlink and uplink direction.
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Report
(1 results)
Research Products
(9 results)
